So to start list what's been done
This is a 1986 evo 1340

Heads where ported and polished
Valve job
New valves
New springs

Put new pistons
10:1

New andrews ev27 cam and bearing

Andrews adjustable pushrods
S&s lifters
Oil is 40/45 psi when cold at idle
The around 30 psi when hot at idle

It runs great with no problems other then top end chatter noise when warm can not figure it out I pulled the heads and brought them back to the shop that did them he went through them pulled them apart and found nothing, Checked rocker box s to see if new springs maybe hitting
Nothing, valves and pistons have plenty of clearance

My question is if the valve springs he used are to heavy would it cause the valves to slap shut? or could the springs make the noise themselves like the inner spring was contacting the outer? the noise is coming from the top of the head

It's definitely not a lifter problem or pushrod adjustment been thru that a 100 times and replaced both figuring something was bad but not the case

Any ideas or suggestions please
Thanks

 

What lifters(?)and what are the pushrods adjusted to?
Scott

 

There S&S Hydraulic lifters

The pushrods are at 3 full turns (18 flats)

 

We set those 32 tpi S&S pushrods to .140-150" lifter load here.
That 27 does have a pretty aggresive ramp.
Scott

 

Should I try re adjusting them again
I've adjusted them a couple times now but the noise in the top end will not go a way
They've been adjusted from 2, 2 1/2 now 3 turns and the noise has never changed

 

What oil, Dale?
Scott

 

amsoil

 

Next oil change try some 50W Spectro, or Torco.
Scott

 

I've heard that it's not a good idea to run amsoil in the older evos. I'm an amsoil guy in everything else but I was told that the evos actually need some decent viscosity and that amsoil is too smooth. Please let me now if you you've heard different.

 

[QUOTE=Ripcurl;12737965]I've heard that it's not a good idea to run amsoil in the older evos. I'm an amsoil guy in everything else but I was told that the evos actually need some decent viscosity and that amsoil is too smooth. Please let me now if you you've heard different.]

Here we go..........